Slide fastener



G. SUNDBACK SLIDE FASTENER March `6, 1934.

Filed Oct. 26, 1929 IN VEN TOR.

Gc'deaw San/Mack, BY WX@ ATTORNE S.

Patented Mar. 6i, 1934 UNITED STATES PATENT@ OFFICE SLIDE FASTENER Application October 26, 1929, Serial No. 402,729

Claims.

My invention relates to separable fasteners, particularly of the slide fastener type.

Slide operated separable fasteners havel now come into general use in all kinds of clothing, luggage, receptacles and other articles. Such a fastener comprises a pair of stringers each having a series of closely spaced interlocking fastener elements attached along the beaded edge of a Stringer tape by means of integral clamping jaws engaging such beaded edge.

Various methods of buliding up this beaded edge have been devised, the most satisfactory of which heretofore, has been to sew a separate cord on each side of, and along one edge of a flat Woven or braided fabric. This isthe method described in my Patent No. 1,243,458, dated October 16, 1917.

Fastener stringers having beaded edges built up by attaching separate cords on opposite sides of the edges of tapes have proven much more satisfactory than stringers having a single enlarged cord, woven or braided .in the edge of the tape. The Stringer having two or more cords is superior to the single corded edge construction for the reason that, in the latter, the clamping jaws of the interlocking elements cut into the threads surrounding the cord at the rear side of the beaded edge thus decreasing the strength of the tape. lt will be understood that in the single corded -edge construction the weft threads of the tape pass around the cord and thus when the threads around the cord are broken the fabric is materially weakened. A further reason that the plural edge construction is superior is that it provides more abrupt Shoulders for cooperation with the clamping jaws of the interlocking elements and thus permits a more positive connec tion.

My present invention contemplates a fastener construction having most or all of the advantages of the double corded edge construction disclosed in my patent mentioned above. At the same time, the sewing operation with its accompanying increase in cost of manufacture is wholly eliminated.

In one of its broadest aspects, my invention consists of a flexible strip with a separate member disposed along one edge and fastener elements clamped over the edge of said strip and member.

The general object of my invention is therefore to provide an improved fastener construction.

Another object is to provide a fastener of the type having a series of interlocking elements along one edge with an improved beaded edge for holding the fastener elements.

Still another object is to provide .an improved fastener stringer having a plurality of cords along one edge for engagement with the clamping jaws of fastener' elements, such cords being held in positon only by said fastener elements.

. yOther objects and advantages of my invention will be apparent from the foregoing general statement and the following description of some specific embodiments.

In the accompanying drawing I have Shown for purposes of illustration one preferred embodiment and several modifications thereof which my invention may assume in practice.

In this drawing,

Fig. 1 illustrates one type of slide fastener with which my invention may be incorporated;

Fig. 2 is a transverse section through one of the stringere before attachment of the fastener elements;

Fig. 3 is a similar transverse section after at tachment of the fastener elements;

Fig. 4 is a transverse section similar to Fig. 3 showing a modified form of the invention;

Fig. 5 is a similar view showing another modiiication;

Fig. 6 is a transverse view through a Stringer before attachment of the fastener elements showing still another modification; and

Fig. 7 is a section view showing a fourth modiication.

Referring to the drawing, the complete fastener illustrated in Fig. 1 includes two mating stringers, each having a flexible strip 11 preferably of woven or braided tape and a series of fastener elements 12 attached along one of the longitudinal edges of the tape. A slider 13 is moved along the series of fastener elements to engage and disengage them in a manner well known in the art. The fastener elements and slider herein shown are of the same general type as those disclosed in my former Patent No. 1,219,881.

As best illustrated in Fig. 2 the woven flexible strip 11 of each Stringer has preferably an enlarged warp or cord 14 woven into the strip along one edge. A pair of twisted or braided cords 15 or 16, preferably twisted in opposite directions, are arranged on opposite sides of the tape 11 immediately behind the beaded edge of the tape formed by the enlarged warp 14. In Fig. 3 one of the fastener elements 12 is shown on enlarged scale after attachment to the other part of the Stringer. The fastener elements are held on by a pair of clamping jaws 17 and 18 which are compressed upon the loose cords and 16, the latter assuming a somewhat flattened form as clearly shown in Fig-3. This provides a con- -struction wherein the adjacent ends19 and 20 of each of the fastener elements may interlock securely held in position and eiectivelyprevei't relative movement or twisting of the fastener` element. The beaded'edge of the tape foified by the lenlarged warp 14 servestoiprevnt n'iovemeiit' of the cords 15 and 16 from the-edgebf-"th'e tape- I the modified constructionshown in Fig-4* 4a strip of iiexible materiale?? whichmay-bezwof I any desired fabric constructionfleatleor other tire separatY strip or cordA 31 SMQ.. edge portion 35. -A

suitable material, is folded over along thelongil tadillial .edge .as .indicated am@ On thje; Side oll't' the folded over portion isjaijraneedfa' separate strip er mayenne; t'ej paianeeztheporden"oijf1fgdesired, suitaplef-gnidesjniey pel-grae for folding over the edgeiof'the material 1 -isrd into the menare the proper position. 'construction provides "1t np beaded edge for receiving the .eternews ligand f8 ofthe fastenerelements.l

l' rig: 's' hiere is illustrated@ nqqine'etion p'aiticularlyr adapted for the attachment-Lof fast` 'r er elemen v A `Astripiof leather 32which n'y, "ini-'seine instances;

eonstitute an integrall smefl-tife-erneie'to anni aasldesired 11e-iathe fastenevr has itsWdo'Igitudinal edge skivd or rolled to provide lgroove'sj33 and 34cm opposite sides'of the piece` of material and disposed on opposite sides and along the edge 'fth'e piece 'f material 32"'-and fit into the grooves 33 and 34 respeetivelyi' so l"that when the cla'nping jaws 17 and 18 of the fastener elements are clamped -together, 'fthe'eords or-stripsof -nat'n' `1l interlock in the grooves tehold them-in position. The cords 36 and37 may belsecued to the leatherbefore attachmentofthe fastener ele'rnents, or may be assembled therewith at the same time.

In Fig. 6, I have illustrated still another modification wherein a beaded edge tape construction s'm'lar 'to 'one ofthe types formerly used in fasteners is employed; lThis construction oomprises a web portion 38 which may be braided or woven, and a tubularwoven or braidedportion 39 preferably integral ith the web portion, the

tubular portion enclosing a hard twisted cord 4 0. Thisiis the construction referred to above, wherein `tlie'weft threads at about the points indicated at 41 and 42 are frequently out by the clamping fiawsof the fastener elements. By the use of my' invention a pair of separate protecting strips 43 and'44 may be disposed in contact with the surfaceAof the corded edge portion acacent the to cover thepoint's 41 and 42. be 'of fabric or any other suit# we 'portion so as These strips may able material.

j -The ferm iustrated ming. '1 issnmni te beenderen,

ts' directlyt' leather or other pair of cords 36 and37 are fabrics are-used;l

l, As a result ofmy invention it will be noted that a novel fastener construction has been devised "wherein mostv ifnot all of the advantages of the double corded edge Stringer construction are se- "cured, and at the same time the expense incurred .in sewing'on the cords or attaching same in any `jsitablje vmanner i iswholly eliminated.

-j'VVhile I have -this vapplication shown and described specifically. some s forms which` may be assumedby my invention in `practice, it will be understo'dfthat these forms are v. merely for the purposes'of rillustration, and that Yarious changes may departing fromthefspirit 'of -nvention'tle scope of which'is defined in the following claims.`

' What I` claim as r'ny invention s': n

1. jInn'a slide fastener, a fastener Stringer coinprisinga -strip of fabric having a beaded edge formed'integral therewith, a separate cord ning ralong the longitudinal edge of said fabric strip but not 'attached directly thereto, said cord -beingdisposed in contact with said beaded edge,

anjd-ffaste'ner 'elements having portions einbracing saidljoord and beaded edge. l 2. lIn afslide fastener, a fastener Stringer com= prising av fabricv strip Ahailing a beaded e'dge, ya s'paate'fleirible member disposed-in contact aid beaded edge 'but not attached directly tisfaid fabric strip,.vand a series of fastener elements havingclarnp'ing .poi-,tiens engaging 'said beaded, edge ansfiexibie Hennef'. A

3. In va 'slide fastener, a'- fastener Stringer difi prising 'a woven tape having an integral 'erfded edge, separate corchlfclis e'don caen side said tape, said cordv being' disposed in 'contact 'Qfth said eorde'd edge "and a se'i's bf yintel-fric@ mgl elements havin A g claiiip' 'jaws' said cords' and "corded edgev Aand fofni'g the sole means 'flor' attaching' 'said erdstsai'd'ta" ""ff' Y '4. "In slide fastener, festen-ef stigereer: rinsing piece ef-neiti'e material, a 'ecru disfp'ese'd 'en eeen side ef 'en' edge 'ef said pi'eee'ef materiaLsaid material having means woven-ifntegr'al therewith adapted to 'engage said 'c''r'ds tending to prevent movement of 'the cords from te mede andfther' fenns 'preaueed without ids ifo

iis

the edge of said material, and a series of fastener elements clamped around said cords and edge 'of material to hold said cords in place the clamp'- ing portions of the fastener elements being the sole means for holding the cords in position 'on the Stringer.

5. In a fastener, a fastener 'stringe'r comprisiing a strip of fabric material, said strip having a beaded edge woven integrally therewith, apair of flexible members disposed loosely `on opposite sides of said strip in contact "with `said beaded edge, and fastener elements engaged around'said nexible .members and beaded edge. .Y 

